Astrobiology
Chapter Exam Questions
Course Introduction
Astrobiology is an interdisciplinary field that explores the origin, evolution, distribution, and future of life in the universe. The course examines how life emerged on Earth, the conditions required for life to exist, and the potential for life beyond our planet. Students will study the chemical and physical processes that underpin biological systems, the search for habitable environments within our solar system and beyond, and the scientific techniques used to detect biosignatures on exoplanets. Emphasis is placed on planetary science, microbiology, astronomy, and the development of life detection technologies, fostering a comprehensive understanding of humanitys place in the cosmos.
Recommended Textbook
The Cosmic Perspective 8th Edition by Jeffrey O. Bennett
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Chapter 1: A Modern View of the Universe
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Q1) From the fact that virtually every galaxy is moving away from us and more distant galaxies are moving away from us at a faster rate than closer ones,we conclude that
A)the Milky Way Galaxy is expanding.
B)we are located at the center of the universe.
C)the farthest galaxies will eventually be moving faster than the speed of light.
D)the universe is expanding.
E)the universe is shrinking.
Answer: D
Q2) In the grapefruit model of the solar system,it would take a few minutes to walk from the Sun to the inner edge of the Kuiper Belt (Pluto).
A)True
B)False
Answer: True
Q3) A typical supercluster contains no more than about 10,000 stars.
A)True
B)False
Answer: False
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Chapter 2: Discovering the Universe for Yourself
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Q1) If,from the point of view of Earth-bound observers,the Moon is in new Moon phase on a particular day,what phase is Earth as seen from the Moon?
Answer: full Earth
Q2) Suppose you lived on the Moon near the center of the face that we see from Earth.During the phase of new Moon,what phase would you see for Earth? Would it be day or night at your home?
Answer: During the new Moon,it would be nighttime and you would see the phase of full Earth.
Q3) Why is the Moon not completely invisible (it appears as a very deep red color)to the naked eye during a total lunar eclipse?
Answer: The Moon shines through reflected light from the Sun and thus it becomes very dark during a lunar eclipse since the Moon lies within Earth's shadow at this time.However,some sunlight still gets through because it is bent (similar to the way a lens works)by Earth's atmosphere.We see the reflection of this faint light and thus the Moon is not completely invisible.(The bending of light is called refraction and the effect is strongest at long wavelengths.Thus it is most pronounced for red light and the eclipsed Moon appears dark red. )
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Chapter 3: The Science of Astronomy
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Q1) Copernicus's model of the solar system gave much better predictions than the model of Ptolemy.
A)True
B)False
Answer: False
Q2) Which of the following best describes how modern astronomers view astrology?
A)Astrology played an important part in the development of astronomy in ancient times,but it is not a science by modern standards.
B)Astrology is a synonym for astronomy.
C)Astrology was a great idea until it was disprove by the work of Copernicus,Tycho,Kepler,and Galileo.
D)Astrology is new age mumbo-jumbo that was a waste of time when it was invented thousands of years ago and remains a waste of time today.
Answer: A
Q3) In the Ptolemaic system,Venus should not show phases.
A)True
B)False
Answer: False
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Chapter 4: Making Sense of the Universe: Understanding
Motion, Energy, and Gravity
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Q1) Suppose you kick a soccer ball straight up to a height of 10 meters.Which of the following is true about the gravitational potential energy of the ball during its flight?
A)The ball's gravitational potential energy is greatest at the instant it returns to hit the ground.
B)The ball's gravitational potential energy is greatest at the instant when the ball is at its highest point.
C)The ball's gravitational potential energy is always the same.
D)The ball's gravitational potential energy is greatest at the instant the ball leaves your foot.
Q2) Suppose you heat up an oven and boil a pot of water.Which of the following explains why you would be burned by sticking your hand briefly in the pot but not by sticking your hand briefly in the oven?
A)The oven has a higher temperature than the water.
B)The water has a higher temperature than the oven.
C)The oven has a higher heat content than the water.
D)The molecules in the water are moving faster than the molecules in the oven.
E)The water has a higher heat content than the oven because of density.
Q3) State Newton's three laws of motion.
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Chapter 5: Light and Matter: Reading Messages from the Cosmos
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Q1) Electrons orbit an atomic nucleus like planets orbit the Sun.
A)True
B)False
Q2) Which forms of light are lower in energy and frequency than the light that our eyes can see?
A)infrared and radio
B)ultraviolet and X-rays
C)visible light
D)infrared and ultraviolet
Q3) From lowest energy to highest energy,which of the following correctly orders the different categories of electromagnetic radiation?
A)infrared,visible light,ultraviolet,X-rays,gamma rays,radio
B)radio,infrared,visible light,ultraviolet,X-rays,gamma rays
C)visible light,infrared,X-rays,ultraviolet,gamma rays,radio
D)gamma rays,X-rays,visible light,ultraviolet,infrared,radio
E)radio,X-rays,visible light,ultraviolet,infrared,gamma rays
Q4) Any object moving relative to Earth will have a Doppler shift.
A)True
B)False
Q5) What does atomic number refers to?
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Chapter 6: Telescopes: Portals of Discovery
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Q1) Professional astronomical telescopes generally have a much greater magnification than the telescopes you can buy in stores.
A)True
B)False
Q2) At which wavelength range is there no current or planned space observatory?
A)radio
B)infrared
C)visible
D)X-ray
E)gamma-ray
Q3) Improvements in technology will eventually allow the entire electromagnetic spectrum to be observed from high mountaintop observatories.
A)True
B)False
Q4) Explain how adaptive optics works.
Q5) X-ray telescope mirrors are very similar to optical telescope mirrors.
A)True
B)False
Q6) Explain what an interferometer is and give an example.
Page 8
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Chapter 7: Our Planetary System
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Q1) Which of the following statements about the asteroid belt is not true?
A)The combined mass of all the asteroids is roughly the same as the mass of Earth.
B)It is located between the orbits of Mars and Jupiter.
C)Asteroids in the asteroid belt orbit the Sun in the same direction that planets orbit the Sun.
D)Asteroids in the asteroid belt are made mostly of rock.
Q2) Based on the frequency with which we see comets from Earth,astronomers estimate the total number of comets in the solar system to be
A)100 million.
B)1 billion.
C)10 billion.
D)100 billion.
E)1 trillion.
Q3) All four of the giant outer planets-Jupiter,Saturn,Uranus,and Neptune-have rings.
A)True
B)False
Q4) What are some of the things that make Earth unique in the solar system?
Q5) Briefly summarize the differences between terrestrial and jovian planets.
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Chapter 8: Formation of the Solar System
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Q1) Which of the following has not been detected around other stars in the Galaxy?
A)a collapsing nebula of gas
B)flattened,spinning disks
C)jovian planets
D)asteroids
E)strong stellar winds
Q2) How does the data from ALMA provide direct evidence for nebular theory?
A)It shows concentric gaps in the disk which are almost certainly regions being cleared as planets form.
B)We can see large planets forming.
C)The amount of energy being radiated by the star system indicates there must be planets present.
D)Data from ALMA does not support nebular theory,instead it is causing scientists to revise the theory.
Q3) What percentage of the solar nebula's mass consisted of rocky material?
A)0 percent
B)0.4 percent
C)2 percent
D)20 percent
E)80 percent
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Chapter 9: Planetary Geology: Earth and the Other
Terrestrial Worlds
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Q1) What are the two geological features that appear to set Earth apart from all the other terrestrial worlds?
A)shield volcanoes and plate tectonics
B)plate tectonics and widespread erosion
C)significant volcanism and tectonics
D)mantle convection and a thick atmosphere
Q2) Which of the following regions was the result of plumes of hot mantle rising in a hot spot within a plate?
A)Alaska's Aleutian Islands
B)Japan and the Philippines
C)the islands of Hawaii
D)the volcano Mount St.Helens
E)all of the above
Q3) Why is erosion more effective on Earth than on Venus or Mars?
Q4) Why are there fewer large craters on the seafloor than on the continents?
A)The seafloor crust is younger than the continental crust.
B)The oceans slow large impactors and prevent them from making craters.
C)The oceans erode away craters faster than erosion processes on land.
D)Large impactors primarily strike land masses.
E)Large impactors aim for life-forms such as dinosaurs.
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Chapter 10: Planetary Atmospheres: Earth and the Other
Terrestrial Worlds
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Q1) Which of the following planets has the least substantial atmosphere?
A)Venus
B)Earth
C)Mars
D)Neptune
E)Mercury
Q2) Which of the following statements about the greenhouse effect is true?
A)Without the naturally occurring greenhouse effect,Earth would be too cold to have liquid oceans.
B)A weak greenhouse effect operates on Mars.
C)The burning of fossil fuels increases the greenhouse effect on Earth because of the release of carbon dioxide.
D)One result of an increased greenhouse effect on Earth may be an increased number of severe storms.
E)All of the above are true.
Q3) The "no atmosphere" temperature of a planet is never higher than the planet's actual temperature.
A)True
B)False
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Chapter 11: Jovian Planet Systems
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Q1) Process of Science: Scientists have not observed Io's interior nor measured its internal temperature.What evidence do we have of Io's strong tidal heating from Jupiter?
Q2) It is very cold,but otherwise quite comfortable.You breathe deeply.Although there is no oxygen (not to worry-your life-support belt will take care of that problem),the air pressure is quite tolerable and seems almost Earth-like (because it is mostly nitrogen).Your vista might even include such breathtaking sights as an ocean of liquid methane before you,and snow-capped (methane snow)mountains behind (although the atmosphere is very smoggy and the visibility consequently is limited).Your solar day is about 16 Earth days long.A large,ringed object seems to hang in your sky,never rising or setting;however,it goes through phases from new to full and back to new again with the same 16-day period as the rising and setting of the Sun.
Q3) Suppose the jovian planet atmospheres were composed 100 percent of hydrogen and helium rather than 98 percent of hydrogen and helium.How would the atmospheres be different in terms of color and weather?
Q4) Describe the leading scenarios for the origin of the planetary rings.What makes us think that ring systems must be continually replenished?
Q5) Why is Triton such an unusual satellite?
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Chapter 12: Asteroids, Comets, and Dwarf Planets: Their
Nature, Orbits, and Impacts
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Q1) According to current evidence,Pluto is best explained as
A)a large member of the Kuiper belt.
B)a terrestrial planet that is surprisingly far from the Sun.
C)a very small jovian planet.
D)an escaped moon of Jupiter or Saturn.
Q2) Which is closest to the average distance between asteroids in the asteroid belt?
A)1 thousand km
B)10 thousand km
C)100 thousand km
D)1 million km
E)10 million km
Q3) What part of a comet points most directly away from the Sun?
A)the nucleus
B)the coma
C)the jets of gas
D)the plasma tail
E)the dust tail
Q4) Process of Science: Why did astronomers identify Pluto as a planet from its discovery? What scientific evidence led to its reclassification?
Page 14
Q5) How are asteroid masses measured?
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Chapter 13: Other Planetary Systems: The New Science of Distant Worlds
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Q1) The total amount of light from a star-planet system drops when the planet goes behind the star.
A)True
B)False
Q2) The Kepler mission has been able to measure dimmings of less than 0.01% in a star's brightness.This has allowed us to detect what size planets?
A)planets smaller than Earth
B)planets Earth-size only
C)only planets larger than Earth
D)any size planet,as long as they are in binary star systems
Q3) The signature of a planet is largest in transit measurements when the planet and star are lined up along the line of sight to the telescope.
A)True
B)False
Q4) Calculate how much (as a percentage)an Earth transit would reduce the light from the Sun as viewed from a distant planetary system.
Q5) Why is our Jupiter not a "hot Jupiter"?
Page 15
Q6) Why is it so difficult to make a direct image of a planet around another star?
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Chapter 14: Our Star
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Q1) The Sun's average surface (photosphere)temperature is about
A)1,000,000 K.
B)5,800 K.
C)1,000 K.
D)37,000 K.
Q2) What are coronal holes?
A)regions on the photosphere where magnetic lines poke through,creating the cooler areas of the sunspots
B)areas of the corona where magnetic field lines project into space,allowing charged particles to escape the Sun,becoming part of the solar wind
C)holes in the corona of the Sun that allow us to see the photosphere
D)tunnels in the outer layers of the Sun through which photons can escape more quickly than through the radiation zone
E)all of the above
Q3) How does the Sun's mass compare to Earth's mass?
A)The Sun's mass is about 300 times the mass of Earth.
B)The Sun's mass is about 30 times the mass of Earth.
C)The Sun's mass is about 300,000 times the mass of Earth.
D)Both have approximately the same mass.
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Chapter 15: Surveying the Stars
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Q1) The approximate main-sequence lifetime of a star of spectral type O is
A)10,000 years.
B)3 million years.
C)300 million years.
D)10 billion years.
Q2) Which of the following terms is given to a pair of stars that we can determine are orbiting each other only by measuring their periodic Doppler shifts?
A)eclipsing binary
B)spectroscopic binary
C)visual binary
D)double star
Q3) Which of the following is the most common type of main-sequence star?
A)an O star
B)an A star
C)an F star
D)an M star
E)a G star
Q4) Which group represents stars that are cool and dim?
Q5) Which star has the greatest luminosity?
Q6) Which group represents stars of the largest radii?
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Chapter 16: Star Birth
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Q1) Why does the rotation of a protostar slow down over time?
A)All rotating objects slow down over time.
B)Magnetic fields can transfer angular momentum to the protostellar disk and protostellar winds can carry angular momentum away.
C)The onset of fusion causes the rotation rate to slow dramatically.
D)Magnetic fields of other stars interact with the magnetic fields of the protostars,slowing its rotation.
Q2) What happens to the surface temperature and luminosity when a protostar undergoes convective contraction?
A)Its surface temperature and luminosity increase.
B)Its surface temperature remains the same and its luminosity decreases.
C)Its surface temperature and luminosity decrease.
D)Its surface temperature decreases and its luminosity increases.
E)Its surface temperature and luminosity remain the same.
Q3) The core of a protostar that will eventually become a brown dwarf shrinks until
A)the type of pressure called degeneracy pressure becomes important.
B)its central temperature is high enough to support fusion reactions.
C)it forms a rocky core.
D)it radiates brown light.
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Chapter 17: Star Stuff
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Q1) What types of stars end their lives with supernovae?
A)all stars that are red in color
B)all stars that are yellow in color
C)stars that are at least several times the mass of the Sun
D)stars that are similar in mass to the Sun
E)stars that have reached an age of 10 billion years
Q2) After a supernova explosion,the remains of the stellar core
A)will always be a neutron star.
B)be either a neutron star or a black hole.
C)will always be a black hole.
D)may be either a white dwarf,neutron star,or black hole.
Q3) Suppose that hydrogen,rather than iron,had the lowest mass per nuclear particle.Which of the following would be true?
A)Stars would be brighter.
B)Stars would be less massive.
C)All stars would be red giants.
D)Nuclear fusion could not power stars.
Q4) Do you think it is possible that a carbon star could harbor an advanced civilization?
Explain your reasoning.
Q5) Briefly explain why high-mass stars have shorter lifetimes than low-mass stars.
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Chapter 18: The Bizarre Stellar Graveyard
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Q1) Which of the following statements about degeneracy pressure is not true?
A)Degeneracy pressure can continue to support an object against gravitational collapse even if the object becomes extremely cold.
B)Degeneracy pressure arises from a quantum mechanical effect that we don't notice in our daily lives.
C)Black holes form when gravity overcomes neutron degeneracy pressure.
D)Degeneracy pressure can arise only from interactions among electrons.
Q2) How does an accretion disk around a neutron star differ from an accretion disk around a white dwarf?
A)The accretion disk around a neutron star is made mostly of helium while the accretion disk around a white dwarf is made mostly of hydrogen.
B)The accretion disk around a neutron star is more likely to give birth to planets.
C)The accretion disk around a neutron star is much hotter and emits higher-energy radiation.
D)The accretion disk around a neutron star always contains much more mass.
Q3) What would happen if a small piece (say the size of a paper clip)of neutron star material struck Earth?
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Chapter 19: Our Galaxy
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Q1) Red and orange stars are found evenly spread throughout the galactic disk,but blue stars are typically found
A)in the halo.
B)only in or near star-forming clouds.
C)only in the central bulge.
D)evenly spread throughout the galactic disk.
Q2) Suppose you want to observe and study the radiation from gas inside an interstellar bubble created by a supernova.Which of the following observatories will be most useful?
A)the Chandra X-ray Observatory
B)the Keck I telescope on the summit of Mauna Kea
C)the SOFIA airborne infrared observatory
D)the Hubble Space Telescope
Q3) What produces the striking red,blue,and black colors of ionization nebulae?
Q4) Which of the following comprise the oldest members of the Milky Way?
A)the Sun and other solar mass stars
B)O stars
C)red giant stars in spiral arms
D)Cepheid variables
E)globular clusters
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Chapter 20: Galaxies and the Foundations of Modern Cosmology
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Q1) What is the most accurate way to determine the distance to a nearby galaxy?
A)radar ranging
B)stellar parallax
C)using Cepheid variables
D)Hubble's law
Q2) How does the age of the universe depend on Hubble's constant,and why?
Q3) Although it is difficult to tell from our vantage point inside the galaxy,astronomers suspect that the Milky Way is a barred spiral.
A)True
B)False
Q4) Process of Science: Describe how scientists measure the distances to galaxies,starting with how they measure the distances of the nearest stars.Be sure to include enough detail so that someone who does not know the jargon of astronomy can still understand your explanation.
Q5) If we were to measure Hubble's constant 10 billion years in the future,we would find it exactly the same as it is today.
A)True
B)False
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Chapter 21: Galaxy Evolution
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Q1) What is a galactic wind?
A)a jet of ionized particles shot out of a starburst galaxy
B)hot gas erupting into intergalactic space from a large superbubble
C)the heat (infrared radiation)emitted by dust grains in the large molecular clouds of starburst galaxies
D)the cooler gas pushed out of a starburst galaxy by the intense radiation pressure
E)a wind created by the expansion of the universe that can move galaxies around
Q2) I observe a galaxy that is 100 million light-years away: what do I see?
A)the light from the galaxy as it is today,but it is blueshifted
B)the light from the galaxy as it is today,but it is redshifted
C)the light from the galaxy as it was 100 million years ago and it it blueshifted
D)the light from the galaxy as it was 100 million years ago and it is redshifted
E)Nothing: the galaxy lies beyond the cosmological horizon.
Q3) Galaxy collisions were more common in the past.
A)True
B)False
Q4) How are the jets produced by radio galaxies similar to those from protostars?
Q5) How does a starburst end? What might happen to the galaxy afterwards?
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Chapter 22: The Birth of the Universe
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Q1) Process of Science: Why do we test theories about the Big Bang using particle accelerators instead of just using bigger and bigger telescopes to look further back in time?
Q2) Briefly explain how Hubble's discovery of a relationship between galactic distance and redshift led to the idea of the Big Bang.
Q3) Which of the following statements cannot be tested by science today?
A)Our universe is flat.
B)Prior to the Planck time,our universe sprouted from another universe.
C)The universe is 14 billion years old.
D)The expansion of the universe is now accelerating.
Q4) Which of the following statements about the cosmic background radiation is not true?
A)It has a temperature of about 3 degrees K above absolute zero.
B)It is the result of a mixture of radiation from many independent sources,such as stars and galaxies.
C)It had a much higher temperature in the past.
D)It was discovered by Penzias and Wilson in the early 1960s.
E)It appears essentially the same in all directions (it is isotropic).
Q5) What did COBE find regarding the smoothness of the cosmic background radiation?
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Chapter 23: Dark Matter, Dark Energy, and the Fate of the Universe
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Q1) Which of the following best sums up current scientific thinking about the nature of dark energy?
A)Dark energy most likely consists of a form of photons that we can't see or detect.
B)Dark energy is most likely made up of weakly interacting particles that do not interact with light.
C)Dark energy probably exists,but we have little (if any)idea what it is.
D)Dark energy is the source of the mind weapon used by Sith Lords in Star Wars.
Q2) What are peculiar velocities?
A)velocities perpendicular to our line of sight
B)velocities directly along our line of sight
C)velocities that we cannot explain by only the force of gravity
D)velocities caused by the expansion of the universe
E)velocities of distant objects that are not caused by the expansion of the universe
Q3) Why do we call dark matter "dark"?
A)It is dark brown or dark red in color.
B)It blocks out the light of stars in a galaxy.
C)It emits no radiation that we have been able to detect.
D)It contains large amounts of dark-colored dust.
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Chapter 24: Life in the Universe
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Q1) Why didn't oxygen begin to accumulate in the atmosphere until approximately 1.5 billion years after life appeared on Earth?
A)Early forms of animal life consumed the oxygen.
B)Early forms of plant life consumed oxygen.
C)All the oxygen produced by life went into making the ozone layer.
D)Oxygen produced by life was removed from the atmosphere by oxidation reactions with surface rocks.
E)Oxygen produced by life was removed from the atmosphere by dissolving in the ocean.
Q2) What evidence do we have that life arose quickly?
Q3) When did oxygen begin to accumulate in the atmosphere?
A)as soon as Earth was formed
B)about 2 billion years ago
C)about 200 million years ago
D)as soon as the early bombardment ended
E)as soon as life appeared
Q4) Why is the discovery of ice fountains on Enceladus so important?
Q5) Briefly summarize current knowledge about the term ( f )life in the equation Number of Civilizations =Np × flife × fcivilization × fnow.
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Q6) What is the evidence that suggests planetary systems are common in the universe?
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Chapter 25: Celestial Timekeeping and Navigation
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Q1) The south celestial pole appears on your meridian at an altitude of 30° in the south.Where are you?
A)latitude = 30°S
B)latitude = 60°S
C)latitude = 30°N
D)latitude = 60°N
E)the South Pole
Q2) All directions are south from the North Pole.
A)True
B)False
Q3) Suppose that you are looking at the sky at about midnight on the winter solstice.Which star will be nearest to your meridian?
A)Alpha Centauri
B)Sirius
C)Spica
D)Deneb
Q4) Suppose you live at latitude 30°N.Which star is never visible in your sky?
Q5) The Winter Triangle is formed by the stars Betelgeuse,Rigel,and Aldebaran.
A)True
B)False
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Chapter 26: Space and Time
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Sample Questions
Q1) Julia is traveling away from you at 0.95c when she shoots a probe forward from her spacecraft.According to her,the probe travels at 0.8c.How fast do you see the probe going?
Q2) If you see Al going to your left at exactly 0.99c and Bob going to your right at exactly 0.99c,Al will say that Bob is
A)going away from her at 1.98c.
B)going away from her at exactly 0.99c.
C)going away from her at exactly c.
D)going away from her at about 0.98c.
E)going away from her faster than 0.99c,but slower than c.
Q3) Refer to the race described above.According to the spectators watching in the stands,what happens?
A)The light beam wins the race,but barely-it is going 1 percent of the speed of light faster than Ben.
B)The light beam instantly finishes the race,before Ben even has a chance to start.
C)The light beam wins the race by a large margin because it is going faster than Ben by the full speed of light.
D)Ben beats the light beam to the finish line,becoming a hero.
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Chapter 27: Spacetime and Gravity
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Q1) Which of the following is false?
A)The order of events can be different for observers in different reference frames.
B)From your point of view,time runs slower in the reference frame of anyone moving relative to you.
C)If one observer measures two events to be simultaneous,all observers must agree on their simultaneity.
D)Time dilation is an observationally verified fact.
E)Time runs slower near a black hole.
Q2) How will you feel in your spacecraft?
A)You will be floating weightlessly.
B)You will feel weight,but less than on Earth.
C)You will feel weight,but more than on Earth.
D)You will feel the same weight as you do on Earth.
E)You will feel yourself pressed against the back of your spaceship with great force,making it difficult to move.
Q3) Briefly explain how the universe can be finite yet have no center and no edges.
Q4) Process of Science: Describe a piece of observational evidence supporting general relativity.
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Chapter 28: Building Blocks of the Universe
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Sample Questions
Q1) According to modern understanding,protons and neutrons are each composed of
A)three leptons.
B)two fermions.
C)three quarks.
D)four bosons.
Q2) Process of Science: Why do scientists believe that black holes can't last forever,and do they have any observational evidence to support this idea?
Q3) What do we mean by the spin of a subatomic particle?
A)It describes how fast the particle is rotating on its axis at a given time-if more torque is applied,the particle spins faster.
B)It is one of the basic properties of any particle,and is a measure of the particle's angular momentum.
C)It is a measure of the particle's electrical charge.
D)The spin of a particle describes how the story of the particle is portrayed to journalists.
Q4) Briefly explain why antimatter is difficult to store after it is produced in laboratories.
Q5) Briefly explain how antimatter can be produced by scientists.
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